usb: usb_set_configuration() obeys authorization

Will refuse to configure a non-authorized device.

Update: simplified if statement--thanks to Ragner Magalhaes for the
heads up.

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index a26a7292b61..025ac0bd353 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1483,6 +1483,9 @@ static struct usb_interface_assoc_descriptor *find_iad(struct usb_device *dev,
  * channels are available independently; and choosing between open
  * standard device protocols (like CDC) or proprietary ones.
  *
+ * Note that a non-authorized device (dev->authorized == 0) will only
+ * be put in unconfigured mode.
+ *
  * Note that USB has an additional level of device configurability,
  * associated with interfaces.  That configurability is accessed using
  * usb_set_interface().
@@ -1504,7 +1507,7 @@ int usb_set_configuration(struct usb_device *dev, int configuration)
         struct usb_interface **new_interfaces = NULL;
         int n, nintf;
 
-        if (configuration == -1)
+        if (dev->authorized == 0 || configuration == -1)
                 configuration = 0;
         else {
                 for (i = 0; i < dev->descriptor.bNumConfigurations; i++) {